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Machine Design Magazine, June 2001: Design Optimization Using Coolit |
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Tetrahedral elements, Parallel computing, Better flow visualization |
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Coolit News |
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Over the past few months many new users joined Coolit ranks. Some of the better known names include Cadence Corp., Saab, and Toyota.
Cadence is using Coolit to design telecommunication, medical electronics and industrial control equipment. The company switched to Coolit after CFdesign failed to predict key flow features in a system, despite the company having spent thousands on a PhD consultant and months of design time trying to tame the software. The Coolit-designed system matched the observed behavior and has just been delivered to a Cadence customer in Scotland.
Avionics leader, Saab has switched to Coolit for their high altitude electronics. Saab engineers were a primary mover behind recent Coolit enhancements in the area of transient flows.
Toyota Corporation, one of the few clients who use Coolit for HVAC problems, is designing its manufacturing plants in Japan using Coolit. Toyota has also engaged Daat through its Japanese distributor, CRC, to implement custom enhancements to Coolit. |
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Machine Design, June 2001: Optimization Techniques Using Coolit |
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Machine Design magazine reviewed optimization tools and techniques available in Coolit. For complete article click here. |
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Lockheed-Martin, a premier defense manufacturer, invited Dr. Arik Dvinsky to present a webcast on CFD optimization techniques to its mechanical engineers. The webcast covered both direct and surrogate optimization methods. If you are interested in learning more about it, please email us at support@daat.com |
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Large models take time to reach a converged solution. This time is wasted if the model contains preventable setup errors, such as typos. The first tool that we recommend is to check specified power dissipation at the bottom of Objects Manager. Click Interior to see the total power specified for all interior components and then go down the objects tree using the arrow keys to check every component and assembly. Even for large models such a check takes just a minute or two.
When you input Fan curves, Coolit provides you the fan velocity information next to the specified flow rate. Use it! Most people will miss a typo in flow rate, but would immediately recognize unrealistic velocity.
Get a snapshot of solution after only a few
iterations, by clicking |
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Select File|Properties menu to open the Project Properties dialog, where you can record the information about the project. You can also record information for individual components by opening Notes in Objects Manager. |
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New Features |
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The new powerful feature permits you to divide-and-concur your complex models, by using the new Submodel component, which is used to define subsystems within the main system. For example you can define a Submodel around populated boards, with all components replaced by a Porous Resistance. Once the main project is solved, the subsystems can be loaded into Coolit as standalone projects with all the components and boundary conditions included. The subsystems can now be edited to include more detail and grids; existing components can be modified or removed, new components can be added. In our example, you now can replace the Porous Resistance with components and solve the detailed problem on fine grid. |
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In transient problems, all components, for which you can specify power dissipation and/or temperature, now have the new Transient button in their properties dialog. Use it to specify the power dissipation or the temperature as a function of time. |
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Tetrahedral Elements, Parallel Computing, Better Flow Visualization |
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Several new features are currently being implemented for the next Coolit release. The most important is the tetrahedral grid elements, which will join the rectangular and triangular prisms available now. The new elements will permit modeling new shapes such as spheres.
We are currently testing a new parallel solver, which will take advantage of multi-processor computers.
Flow ribbons are being finalized and may be available as an update, before the next release.
A key feature is being developed for modeling complex systems with fine detail and grid. The fine grid will be used locally only, without propagating through the domain. This feature is currently in advanced research stage and more details will be released as they become available. |
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Load the file in CoolPlot and click the Section
Scalar pull-down box to quickly review the
temperature, pressure and velocity magnitude
variables. Checking the outer ranges of the variables
may lead you to discover an input error. Take a quick
look at component temperatures: cold components
should be cold even in unconverged solutions.